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Related Concept Videos

MicroRNAs01:22

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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miR-302a/b/d-3p Differentially Expressed During Frontonasal Development Is Sensitive to Retinoic Acid Exposure.

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Specific microRNAs (miRNAs), particularly miR-302a/b/d-3p, are crucial in preventing frontonasal malformations. These miRNAs regulate cell proliferation and are affected by environmental factors like retinoic acid.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Frontonasal development failures cause midfacial malformations like frontonasal dysplasia.
  • Epigenetic regulators, including noncoding microRNAs (miRNAs), influence embryonic development.
  • The specific role of miRNAs in frontonasal development remains largely unknown.

Purpose of the Study:

  • To investigate the involvement of miRNAs in mouse frontonasal development.
  • To identify specific miRNAs differentially expressed during critical embryonic stages.
  • To elucidate the functional role of identified miRNAs in cell proliferation and response to teratogens.

Main Methods:

  • Analysis of publicly available miRNA-seq and RNA-seq datasets from mouse embryos (E10.5-E13.5).
  • Overexpression studies in cultured mouse embryonic frontonasal mesenchymal (MEFM) cells and O9-1 neural crest cells.
  • Bioinformatic analyses and miRNA-gene regulation assays to identify miRNA targets.
  • Assessment of miRNA response to all-trans retinoic acid (atRA) exposure.

Main Results:

  • miR-28a-5p, miR-302a-3p, miR-302b-3p, and miR-302d-3p were differentially expressed during mouse frontonasal development.
  • Overexpression of these miRNAs suppressed cell proliferation in MEFM and O9-1 cells.
  • miR-302a/b/d-3p, but not miR-28a-5p, were upregulated by atRA exposure.
  • Inhibition of these miRNAs restored cell proliferation and normalized target gene expression in atRA-treated cells.

Conclusions:

  • miR-302a/b/d-3p play a significant role in regulating cell proliferation during frontonasal development.
  • These miRNAs are implicated in the pathogenesis of atRA-induced craniofacial malformations.
  • Targeting miR-302a/b/d-3p may offer therapeutic strategies for frontonasal developmental disorders.